I've heard good things about the venom but nothing on the GT501 other than from Dunlops reps. I ride Avon cobras on my raider and we're getting 10k out of those and they are the best tire I've found in the wet.
Problem is, Avons are spendy. This bike is for my wife who probably won't put 2k a year on the bike, a budget build. Seems the Dunlops are about 30-60 cheaper than the avons.
Want her to be confident in her tires and safety is my biggest priority for her..